Water-tube boiler



(No Model.)

3 Sheets-Sheet 1. H. s. PELL. v WATER TUBE BOILER.

(No Model.) 3 Sheets-Sheet 2 H. S. PELL.

WATER TUBE BOILER.

No. 597,152. Patented Jan. 11, 1898.

IfJ

(No Model.) 3 Sheets-Sheet 3.

H. S. PELL.

WATER TUBE BOILER.

Patented Jan 11, 1898.

17 2 We/ZZQ/ Er/y @5152,

UNITED STATES .ATENT rricn.

HARRY S. FELL, OF AKRON, OHIO, ASSIGNOR TO THE STIRLING COMPANY, OF CHICAGO, ILLINOIS.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 597,152, dated January 11, 1898.

Application filed January 12,1897. Serial No. 618,936. (No model.)

To coil 2072,0122 it may concern;

Be it known that I, HARRY S. PELL, a citizen of the United States, residing at Akron, Summit county, Ohio, have invented a new 5 and useful Improvement in W'ater-Tube Boilers, of which the following is a specification.

The object of my invention is to imprcwe the Stirling type of boiler; and the invention consists in the features and combinations hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a vertical sectional elevation taken on line 1 of Fig. 3; Fig. 2, a transverse sectional elevation taken on line 2 of Fig. 1; Fig. 3, a plan I sectional elevation taken on lines 3 3 of Fig. 1; Fig. 4, an enlarged transverse sectional View of the chair, taken on line 4: of Fig. 1; and Fig. 5, a sectional elevation of the chair, taken on line 5 of Fig. at.

In constructing myimproved boiler I prefer to use a principal lower mud-drum A, elevated steam and water drums B, B, and B water-pipes b, steam-pipes 1), banks of tubes 0, connecting the lower mud-drums with the elevated steam and water drums, and fire brick partitions and shelves 0', all in the way generally used in a Stirling boiler; but in addition thereto I also employ various other parts or features separately or together, as 0 follows: 7

In order to hold the lower mud-drum steady and prevent undue strain or injury from contraction or expansion of the metal, I provide for supporting the mud-drum on what I call a springchair D. The upper part of this chair d is adapted to conform to the periphery of the lower mud-drum and may be rigidly secured theretoor not, as desired. In the lower part I place a spring or springs d,

just below the upper portion of the chair, in position to receive any jar or shock to which the boiler may be subjected or any undue pressure caused by expansion or contraction of the metal. The spring or springs and the lower part of the upper portion of the chair are preferably confined between flanges (Z extending up from the base. It will of course, be understood that as many of these springs maybe used-one or more-as may be considered practicable in any particular position or construction.

This form of chair is especially applicable when the boiler is to be used for marine purposes, in which use it is necessarily subjected to constant vibrations and jerking or surging motions.

The bridge-wall E in front of the lower mud-drum is preferably of hollow cast-iron construction, and the upper part of this bridge-wall is a fire-brick covering 6. There is an opening (2' under the bridge-wall, prefer- 6o ably at each side of the furnace, and the front side of the bridge-wall is perforated or provided with as many holes or openings 6 as desired. Air entering through the openings under the bridge-wall passes forward through the openings in its front side and thence up through the grate-bars to the furnace. In this way abundant draft is provided for, and the air which feeds the furnace also prevents the bridge-wall from warping or getting out of shape or alinement.

In forming the arch F over the fireplace I prefer to use fire-bricks f of such shape as to form interlocking members. This interlocking of the members serves to hold the arch together and prevents displacement and generally aids in forming a strong and durable construction. It also enables any member to be readily removed when injured by burning or otherwise, so as to permit of the ready 8o insertion of a new member without any displacement or injury to the arch.

I prefer to form the side walls Gof the furnace below the arch of sections provided at their ends with suitable recesses to receive a dovetail retaining member II. These dovetail members are preferably secured to or formed integral with the outer metallic wall or casing I of the boiler and serve to firmly fasten and secure the sections and wall together, hold the same in alinement, and prevent twisting or warping. They are also preferably made in such way as to leave a small ail-space between the outer wall or casing and the inner sections, which air-space servesto prevent undue radiation and keep the outer wall from becoming unduly heated. This form of construction enables the sections of the furnace-wall to be readily inserted or removed at pleasure without any dismantling mo of the furnace. here the furnace is wide, two arches may be formedwith a partition in the center to receive and support the opposing edges of the arches.

I also prefer to form the front Wall L of the boiler above the arch at an incline, so as to confine the heated gases in as small a space as possible in the upper part of the boiler. As shown, this inclined wall is formed of a supporting-ledge l and fire-brick covering Z. The front Wall of the furnace above the inclined portion may be supported by suitable braces or angle-irons Z or in any other convenient way. The front wall being thus inclined, a large amount of dead space is removed from the interior of the boiler, and the gases are consequently confined more closely within the front bank of tubes and loss of heat avoided.

The outer wall or casing is provided with a channel-iron I on its inner surface in position to receive and hold the abutting, ledge f of the arch. In order to stiffen and strengthen the entire construction, I preferably place on the outer side of the metallic wall or casing angle-irons J and pass stay-rods K through the angle-irons and casing and through the furnace from side to side. These stay-rods passing through the boiler from side to side are provided with suitable washers and nuts to lock and hold them in place.

The advantages of my invention are that it provides for a simple, economical, and efficient boiler, compact in form, and capable of use for either land or marine purposes.

Although I have described my invention somewhat minutely, it will of course be understood that I do not intend to limit myself to exact forms, minor features, or details of construction, or to the use of all my improvements in a single boiler. On the contrary, I contemplate making changes in form, omitting parts or using equivalents as circumstances may suggest or render expedient.

I claim 1. In combination with the mud-drum of a water-tube boiler, a spring-chair under the mu d-drum and supporting the same, substantially as described.

2. In a water-tube boiler, a furnace having its side walls formed of sections secured to the outer walls or casing by dovetail members, its arch portion formed of interlocking members, and its abutting ledges secured in channeLirOns, substantially as described.

HARRY S. PELL.

IVitnesses:

D. W. PELL, A. R. HENRY. 

